Grinding-mill.



No. 860,788. PATBNTED JULY 23, 1907.

W. R. CUNNINGHAM.

GRINDING MILL.

APPLICATION FILED APR. 23, 1907.

a. 6. M mm...

UliTElD STTE E OFHCE.

WILLIAM R. CUNNINGHAM, OF BUOYRUS, OHIO, ASSIGNOR TO THE MACHINERY 00., OF BUOYRUS,

AMERICAN CLAY OHIO, A CORPORATION.

GRINDiNG-IMILL.

Specification of Letters Patent.

Patented July 23, 1907.

Application filed April 23,1907. Serial No. 369,717.

citizen of the United States, residing at Bucyrus, in

the county of Crawford and State of Ohio, have invented new and useful Improvements in Grinding- Mills, of which the following is a specification.

This invention relates'to certain new and useful improvements in machines of the type commonly known as grinding and mixing pans, designed particularly for grinding refractory material, and the invention consists of the parts, and the constructions, arrangements, and combinations of parts which I will hereinafter describe and claim.

In the accompanying drawings forming part of this specification and in which similar reference numerals indicate like parts in the several views, Figure l is a front elevation of a mixing and grinding pan embodying my invention, showing a portion of the machine in vertical section. Fig. 2 is a top plan view of Fig. 1, showing parts in section. Fig. 3 is an end view. Fig. 4 is an enlarged fragment of a part of the pan showing the door, 36, closed and the scraper, 44, raised out of the pan. Fig. 5 is a sectional view taken on the line E-F, of Fig. 2, showing the position of the door' when closed and showing the shape of the scraper, the dotted lines showing the position of the scraper and the door when the latter is opened.

In carrying out my invention I employ a frame of suitable design, construction and dimensions, said frame comprising the side standards or frames, 1 and 2, which are appropriately connected at their upper portions bymeans of the cross-bar, 3, the upper portions of which are provided with journal-boxes or bearings in which the driving shaft, 5, is appropriately mounted, said shaft having keyed or otherwise fixed to it the driving pulley, 4, and a beveled pinion, 6, which latter is designed to mesh with a beveled gear-wheel, 7, mounted within the cross-frame, 3, and appropriately secured at the upper end of a vertical shaft 8. This shaft is suitably journaled in the cross-bar, 3, and its lower end is appropriately mounted in a step or bearing, 9.

The pan, 10, is of the construction usually found in this type of machine and it is suitably keyed or otherwise fixed to the vertical shaft, 8, so as to revolve therewith, said pan having in its bottom the wearing plates, 16, upon or over which the mullersor grinding-wheels operate. These mullers have bushings or wearingsleeves, 13, through which project the horizontal transverse shafts, 11, upon which the mullers are rotat-ably mounted.

To the ends of the shaft, 11, are fixed appropriate shoes, 15, which are spring-supported in the sidestandards on the main-frame, and on said shafts, 11, between the shoes and the sides of the grinding-mullers,

are thrust collars 14 of suitable and well known constructionand operating to receive the outward thrust of the mullers.

As thus far described, it will be understood that the 'the drawings 1 have shown but one of said scrapers,

said scraper being set at a suitable angle relative to the muliers and to the inner circumference of the pan and adapted to direct the material into the range of action of the mullers as the pan rotates by power derived from the driving,'shaft,5, and transmitted through the gears, 6 and 7, and the vertical shaft, 8, to which latter the pan' is secured as before noted.

Fixed to and encircling the pan, 10, at its outer edge is a stationary rim, 17, which may be made in two or more sections for convenience in handling where it is necessary to instal it or to remove it for any purpose. This rim is held in position on one side of the frame by suitable hangers, 18 and 19, as shown in Fig. 2, said hangers being mounted upon a tie-bar, 20, extending transversely across the machine over the pan and having its ends passed through the side standards, 1 and 2, of the mainframe. This tie-bar may be secured by suitable means as by the use of tapered-keys, 21, 22, 23 and 24, driven through the slots or openings in the tie-bar upon oppo'-' site sides of the standards, 1 and 2, on the main frame whereby when the wedge-shaped keys are driven into the slots or openings in said bar the latter is drawn tight to the side frames of the machine and thus forms a suitable support for the hangers before mentioned.

On the opposite sideof the rim are other hangers, 25 and 26. These are attached to or mounted on short tiebars 27 which are keyed to the frame-standards, 1 and 2,

in the manner substantially as described for the mounting of the hangers, 18 and 19, at the opposite side of the pan.

. Referring to Figs. 1 and 3, it will be seen that in addition to the parts before described, I employ another tie-bar, 28, which is disposed below the pan and extends r'rom side to side of the main-frame and is keyed to the latter by keys passing through slots in the bar in substantially the manner before described. ,4 The lower I portions of the hangers,- 25 and 26, which, as before Hescribed, are mounted at'their upper ends on the tiebars, 27, arefashioned receive the lower tie-bar, 28, whereby the hangers, 25 and 26, are supported directly upon the upper and lower tie-bars, 27 and 28, as shown the outstanding in Figs. 1 and 3. By this system of tie-bars and hangers it willlbe observed that the rim, 17, is held rigid and firmly to the side standards of the machine while allowing the pan to freely revolve beneath the grindingmullers.

Surrounding and secured to the outer edge of the pan is an angle-iron ring, 30, having a horizontal flange which extends over the outer edge of the pan and having a vertical flange which extends down over the edge of the pan and projects slightly therebelow. This angle-iron ring, 30, is a wearing-ring and is designed to remove the wear from the stationary-rim 17. In practice the angle-iron ring 30 is removably secured so that it may be detached and renewed whenever the conditions make this operation necessary or desirable.

The horizontal flange of the angle-iron ring overlaps a horizontal wearing-plate, 31, bolted or otherwise secured around the outer edge of the top surface of the pan and having its inner edge undercut and engaging over the outer edge of the wearing-plate, 16, to assist in removably holding this latter plate in position, upon which wearing-plate, 16, the wearing-tires, 33, with which the grinding-mullers are supported, operate to grind the material in the well known manner.

At one side, the rim, 17 is cut-away to provide a door as shown included between the lines G-D of Fig. 4, and to said rim, 1?, are attached suitable bearings, 34 and 35, through which pass the horizontal shaft 36 In the door opening in the side of the rim, as before described, is mounted a hinged door, 36, having suitable hub-portions, 37 and 38, through which pass the aforesaid shaft, 36, as shown in the enlarged detailed Figs. 4 and 6.

In Fig. 3, it will be observed that on the outer sides of the said frame" and 2, 1 bolt or otherwise secure kets or hangers, 40 and 41, in the outer portions of which the said shaft, 36, is turnablymounted and appropriately supported, one end of said shaft carrying a pilot-wheel, 42, for operating the door, 36, as I will presently describe. This door, 36, is keyed or otherwise firmly attached to said shaft, and when the operator revolves the pilot-wheel, the connections described. cause the door to turn about the shaft 36 andv swing outwardly and open, as shown by dotted lines, 43, in Fig. 2.

One of the hubs, 37, on the door is made rigid with a scraper, 44, and when the operator turns the pilotwheel to open the door as above stated, the said door causes the scraper, 44, to be lowered to the position shown by dotted lines, 45, in Figs. 2 and 3, said scraper being lowered until it comes in contact with the upper surface of the pan, 10, whereby it will scrape the ground and mixed material and deliver the same through the opening in the stationary rim, 1?, left by raising the door, 36, thereby delivering the pulverized material outside or" the pan.

Suitably secured to the underside of the door, 36, is

. a wearing-plate, 46, of angular or other form, adapted to remove the wear of the rotatable pan from the lower parts of the door. I

The leading part of the present invention relates to the construction of the door, 36, and the means for actuating the same whereby when the material inv the pan is ground or mixed to suit my requirements, the operator revolves the pilot-wheel thereby causing the scares shaft, 36, to be revolved in its bearings; and as thedoor, 36, and the scraper, 44, are made rigid with each other, or substantially in one piece, and are attached firmly to the shaft, 36, it will be apparent that the door and scraper operate in unison to open and close the opening in the pan and to remove the finished product from said pan.

Having thus fully described my invention, what 1 claim as new and desire to secure by Letters Patent, is:

1. In a grinding and mixing mill, the combination with a rotatable pan, and grinding mullers beneath which said pan rotates,- of a hinged door at the 'side of the pan and opening outwardly therefrom, said door having fixed to it a scraper which is normally out of contact with the floor of the pain when the door is closed but which is moved towards said floor coordinately with the outward movement of the door.

2. In a grinding and mixing ,mill, the combination with a rotatable pan, and grinding mullers beneath which the pan rotates, of a stationary-rim surrounding the edge of the pan and having a side-opening, a door controlling the said side-opening of the rim, said door being hinged at its upper end and provided with a scraper, said door and scraper extending upon opposite sides of the axis of the door, and moving in unison in opposite directions, and said scraper being normally removed from the pan and being moved substantially into contact with said pan and into the range of travel of'the material thereon, when the door is opened outwardly.

3. In a grinding and mixing millhaving a. rotatable pan and grinding mullcrs beneath which said pan operates, a stationary-rim surrounding the edge of the pan and provided with a side-discharge opening, a door normally closing said opening and pivotally hung at its upper end, a scraper normally projecting-above the axis of the door, and normally elevated above the floor of the pan, and means for operating the door to open the same outwardly and upwardly and to coordinately lower the scraper toward the pan and into the range of travel of the pulverized material whereby said material is directed through said opening.

4. In a grinding mill having a rotatable pan, grinding mullers beneath which said pan rotates, and a stationaryrim surrounding the outer edge of the pan, and having a side-discharge opening, a combined door and scraper turnable about a horizontal axis common to both and comprising substantially a unitary member with a doorportion extending normally below said axis and a scraper-portion ex tending normally above said axis, and means for operating said member to cause the door-portion thereof to uncover f 5. In a grinding mill having a rotatable pan, grinding mullers beneath which saidpan rotates, and a stationary rim surrounding the outer edge of the pan, and having a side-discliarge opening, a combined door and scraper turn able about an axis common to bothand comprising substantially a unitary member with a door-portion extending normally below said axis, and a scraper-portion extending normally above said axis, and means for operating said member to cause the door-portion thereof to uncover the opening in the rim and to coordinately lower the scraperportion into the pan in the range of travel of the material thereon, whereby the ground material is directed outwardly through said opening, said means consisting of a shaft journaled on the rimand to which the door is fixed, and an operating'mcmber on the shaft for turning the same in its bearings.

6. In a grinding mill having a rotatable pan, grinding mullers beneath which said pan rotates, and a stationarying normally above said axis, and means for operating said member to cause the door-portion thereof to uncover the opening in the rim and to coordinately lower the scraperportion into the pan in the range of travel of the material thereon, whereby the ground material is directed outwardly through said opening, said means consisting of a l shaft extending across the upper portion of the dischargeopening and journaled on the rim, and a pilot-wheel fixed to the outer end of the shaft and affording means for turning the shaft in its bearings.

7. In a grinding mill having a rotatable pan, grinding mullers operable thereover and a surrounding stationary- .rim having a delivery opening, a shaft extending across the of travel of the material thereon, whereby said material is directed outwardly through the delivery opening.

8. In a grinding mill the combination of the main frame, the rotatable -pan, the grinding mullers operable there over, a stationary-rim surrounding the outer edge of the pan and having a side-delivery opening, means for supporting the rim from the mainframe, an angle-iron surrounding the outer edge of the pan having a horizontal flange extending over said edge and having a vertical flange extending downwardly, said angle-iron serving as a wearing member for the pan, and removably-secured wearing plates on the pan and overlapped by the horizontal flange of the said angle-iron.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

WILLIAM R.- CUNNINGHAM. Witnesses:

SAMUEL E. Aucx, G. F. Acmsmuuv. 

